70 lines
3.7 KiB
Markdown
70 lines
3.7 KiB
Markdown
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# HTTP Connection Request Smuggling
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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## Connection state attacks <a href="#state" id="state"></a>
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### **First-request validation**
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Reverse proxies often use the **Host header** to identify **which back-end server to route** each request to, and have a whitelist of hosts that people are **allowed to access.**
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However, some proxies only apply this **whitelist to the first request sent** over a given connection. This means attackers can gain **access to internal** websites by issuing a **request to an allowed** destination, **followed** by one for the **internal site** down the same connection:
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```
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GET / HTTP/1.1
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Host: redacted
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GET / HTTP/1.1
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Host: intranet.redacted
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```
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Mercifully, this **mistake is quite rare**.
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### **First-request routing**
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First-request routing occurs when the front-end uses the **first request's Host header to decide** which back-end to route the request to, and then **routes all subsequent requests** from the same client connection down the **same back-end connection**.
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```
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GET / HTTP/1.1
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Host: example.com
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POST /pwreset HTTP/1.1
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Host: psres.net
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```
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This could be chained with [**Host header attacks**](https://portswigger.net/web-security/host-header) like password reset poisoning, [**web cache poisoning**](https://portswigger.net/web-security/web-cache-poisoning), and gaining access to other virtual hosts.
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{% hint style="info" %}
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You can scan for these two flaws using the 'connection-state probe' option in HTTP Request Smuggler.
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{% endhint %}
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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||
|
|
|
||
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Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
||
|
|
|
||
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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|
|
||
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
||
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|
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||
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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